org.apache.hc.core5.concurrent

## Interface FutureCallback<T>

- Type Parameters:
    `T` - the future result type returned by this callback.
  All Known Implementing Classes:
    CallbackContribution, FutureContribution

      public interface FutureCallback<T>

  A callback interface that gets invoked upon completion of a `Future`.
  Since:
    4.2

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `cancelled()`
    `void` | `completed(T result)`
    `void` | `failed(Exception ex)`

- - ### Method Detail

    - #### completed

          void completed(T result)

    - #### failed

          void failed(Exception ex)

    - #### cancelled

          void cancelled()

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